The Position & Animation of the Steps

So, for the animation, I took the spline again that I used at the very beginning. I placed a first step at the bottom of the escalator and then applied a "path constraint" on the step.

Fig. 10

Fig. 11

I duplicated the step and changed the value of the "Along Path". Between two steps, I set a distance of 2,4. So, the first is at 47,3 and the following step is at 49,7. I repeated this action for each step of the escalator.